Eaton 2075, Operation Manual

Page 1: ... e 18 D 2 7 2 1 1 B A S S U M Tel 04241 3516 FAX 5516 EATON 2075 NOISE GAIN ANALYZER 1 1 1 1 _ T N 2U 5 NOISE GAIN IW O ZER llll flfllT 7 8 9 e 4 5 6 Y 0 1 2 3 1 e oOSf Gl E E 0 __ REVISED DECEMBER 1985 Eaton Corporation Electronic Instrumentation Division Los Angeles California 90066 II ...

Page 2: ...s manufactured by SELLER With respect to repairs the foregoing warranty shall apply for a period of ninety days to the repaired portion REPAIR AND MAINTENANCE Instruments should be returned only on prior authorization from the Representative or the factory You will be advised of detailed shipping instructions at that time Return the instrument to the factory prepaid Validity of warranty will be de...

Page 3: ...Reference Card Pre Operational Adjustments SECTION 3 OPERATION Introduction Capabilities of the Eaton 2075 Controls and Indicators Power On Conditions Preset and Total System Reset Continuous Measurement Mode and the Hold Function Fixed Frequency Operation Swept Frequency Operation Uncorrected and Corrected Measurements Entry of Frequency and ENR Values Selecting the Correct Test Configuration Pro...

Page 4: ...ated Noise Source Noise Drive Voltage and Indicator ENR Tables Calibration Frequency Calibration Second Stage Calibration Input Gain Selection IF Attenuators Calibration Selection of Sideband Parameters Bandwidth Compensation Determining the Bandwidth Ratio of the First and Second Stages Compensation For Loss or Gain Tcold Compensation Oscilloscopes and Recorders to Display Data Selecting an Exter...

Page 5: ...y Remote and Local Modes GPIB Message Types Interface Bus Messages Device Messages Data Messages Status Messages SECTION 5 PERFORMANCE VERIFICATION TESTS Introduction Test Equipment Required Performance Verification Procedures Power On Test Noise Drive Voltage Test IF Attenuators Calibration Final Detector Bias Test Second Stage Calibration Final Detector Linearity Test Scope Plotter Output Test 4...

Page 6: ...ngle Sideband Test Configuration 2 Measurement Single Sideband Test Configuration 3 Calibration Test Configuration 3 Measurement Test Configuration 4 Calibration Double Sideband Test Configuration 4 Measurement Double Sideband Test Configuration 4 Calibration Single Sideband Test Configuration 4 Measurement Single Sideband Test Configuration 5 Calibration Test Configuration 5 Measurement Test Conf...

Page 7: ...Oscilloscope Display Smoothing Indicator General Purpose Interface Bus Sample Data Output Status Byte Flowchart For Data Collection in Test Configuration 1 Using SRQ Data Ready Programming Example For Data Collection in Test Configuration 1 Using SRQ On Data Ready With HP 85 Controller Sample Results From Program of Figure 4 5 Setup in Test Configuration 2 Flowchart For SRQ on Ready To Tune Flowch...

Page 8: ...nd Indicators Power On Preset and Total System Reset Parameters Selecting the Correct Test Configuration Additional Types of Measurements Output Display Special Functions Control Programs For Externat Local Oscillators ASCII Codes Special Functions Error Messages GPIB Functional Capabilities GPIB Function Reference Table Eaton 2075 GPIB Device Codes Eaton 2075 GPIB Front Panel Codes Selection of D...

Page 9: ...the Noise Gain Ana lyzer lt was first released as the Eaton 2075 2 the most recent version is the Eaton 2075 2A Both versions are identical in form fit and function except that in the Eaton 2075 2A the basic input frequency range has been extended The Eaton 2075 2 has an input frequency range of 10 MHz to 1800 MHz The basic input frequency range of the Eaton 2075 2A is 10 MHz to 1850 MHz per its s...

Page 10: ...ecise measurements of noise and gain characteristics of RF devices The analyzer can be controlled in its local mode using its front panel controls or in the remote mode by an external controller via an IEEE 488 GPIB General Purpose Interface Bus 1 2 EATON 2075 The analyzer can make the following measurements Corrected Noise Figure and Gain Uncorrected Noise Figure Corrected Effective Input Noise T...

Page 11: ...ype needed depends on the user applications Also one or more GPIB cables are required to operate the 2075 if an external controller is used or if the 2075 is used to control an external local oscillator Noise sources and GPIB cables are listed in Table 1 2 under Optional Accessories In addition filters mixers and one or two external local oscillators may be required if the Device Under Test is to ...

Page 12: ...e 26 5 GHz 40 GHz 5 Solid State Noise Source 7618E WR28 output 10 MHz 18 GHz 16 Hot Cold Noise Standard 7009 6 Solid State Noise Source 7626 DC 9 GHz 10 MHz 26 5 GHz 17 GPIB Cable 1 Meter 1 998094 7 Solid State Noise Source 230450 2 001 with isolator 1 2 GHz 1 4 Length IEEE 488 GHz 18 GPIB Cable 2 Meter 1 998094 8 Solid State Noise Source 230450 002 with isolator 2 7 GHz 2 9 Length IEEE 488 GHz 19...

Page 13: ...n 2075 Performance Specifications PERFORMANCE LIMIT CONDITIONS CHARACTERISTIC NOISE FIGURE MEASUREMENT Range 0 to 30 dB Resolution 0 01 dB Uncertainty 0 05 dB 1 Noise Figure 0 to 12 dB 2 Temperature 10 to 40 C 3 ENR of 5 to 18 dB 0 10 dB 1 Noise Figure 12 dB 2 Temperature 10 C 40 c GAIN MEASUREMENT Range 20 dB to 50 dB Resolution 0 01 dB Uncertainty 0 2 dB INPUT Frequency Range Specified parameter...

Page 14: ... with MIL STD 461A Methods Postverfuegung 526 527179 CE03 and RE02 CISPR Publication 11 1975 and Messempfaenger Postver fuegung 526 527 79 Kennzeichnung Mit F Nummer Funkschutzzeichen Conducted and Radiated MIL STD 461A 1968 Conducted and radiated susceptibility Susceptibility meets the requirements of methods CSOl CS02 CS06 and RS03 1 Volt meter of MIL STD 461A 1968 GENERAL Noise Source Drive Vol...

Page 15: ...B annunciators are SRQ Service Request RMT Remote TALK Talk LISTEN Listen 4 Parameter Annunciators are LO Local Oscillator RF Radio Frequency IF Intermediate Frequency ENTER Enter Frequency Prompt Gain Display Displays Gain and other values The 8 Annunciators are LOSS Gain is less than zero dB ENR Excess Noise Ratio T F Temperature in Fahrenheit T C Temperature in Centigrade T K Temperature in kel...

Page 16: ...The protective action must not be negated by the use of an extension cord without a protective conductor ground 3 Before switching on the instru ment the protective earth terminal of the instrument must be connected to the protective conductor of the power cord This is accomplished by ensuring that the instrument s internal earth terminal is correctly connected to the instrument s chassis and that...

Page 17: ...earth contact GENERAL INFORMATION 3 Any interruption of the protective grounding conductor inside or outside the instrument is likely to cause damage to the instrument To avoid damage this instrument and all line powered devices connected to it must be connected to the same earth ground 4 Make sure that only fuses with the required rating and of the specified type are used for replacement Fuse rat...

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Page 19: ...mage is evident or if the contents are not complete immediately notify the carrier and also your local Eaton sales office After completing the physical inspection the Performance Verification Procedures in Section 5 of this manual should be performed as an operational or electrical inspection 2 3 AC POWER REQUIREMENTS Prior to shipping the 2075 is configured to operate on 120 VAC 60 Hz line power ...

Page 20: ...e voltage level printed on the voltage selector card This number becomes visible 7 Reinsert the card The desired voltage should be after the fuse is removed visible 4 The unit is normally configured for 120 VAC 8 Replace the fuse after verifying that its rating is operation If the unit is to be operated using this correct For 100 or 120 VAC use the 2 0 Amp line voltage verify that this value is vi...

Page 21: ... 2075 is designed to operate within specified performance limits over an ambient temperature range extending from 0 to 55 degrees Centigrade INSTALLATION Operation outside this range for extended periods will result in degradation of electrical performance and eventual malfunction 2 6 SELECTION OF RELAY DC VOLTAGE The RELAY POWER connector on the 2075 front panel provides voltage to automatically ...

Page 22: ...ove it 7 Locate the pins E 1 through E6 These are located in the center of the board as shown in 3 Two internal covers are exposed Remove the Figure 2 2 above A jumper is installed between nine 4 40 screws which secure the right side pins E3 and E4 selecting 30 volts internal cover the RF Deck Cover and remove the cover 8 To select 5 volts connect the jumper between pins E5 and E6 To select 15 vol...

Page 23: ...s of the two slide mount assemblies and the required mounting screws Both kits are required for mounting the unit on slides For rack mounting on angled brackets only Option 11 is required INSTALLATION NOTE The Slide Mount Kit option must be ordered when the 2075 is originally purchased The unit is shipped with the slide mounts installed 2 8 RACK MOUNTING THE 2075 Refer to Figure 2 3 to attach the ...

Page 24: ...i 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Side View 1 1 1 l J t __IJ rack Fully Extended Position Side View To remove 2075 from rack or to push 2075 back into rack lift locking latch first Note that the adjustable bracket is the rear one NOTE Slide mounts are manufactured by Grant Hardware Corporation City of lndustry CA Code No 10003 P N SS 168 NT 18 Figure 2 4 INSTALLATION OF SUDE MOUNTS Eaton PIN 1 99872...

Page 25: ...T connector is provided on the rear panel of the 2075 to allow measurement or display of the 30 MHz IF signal This signal is the result of the second stage of internal downconversion Install a test cable between this BNC type connector and an appropriate measurement device if desired for test purposes INSTALLATION The DET OUT connector is provided on the rear panel to allow measurement or display ...

Page 26: ...the 2075 This card summarizes information on special functions test configurations and error messages 2 11 PRE OPERATIONAL ADJUSTMENTS The Performance Verification Procedures in Section 5 of this manual should be performed before making measurements with the 2075 These procedures constitute an operational or electrical inspection of a newly purchased unit and they can easily be performed in less t...

Page 27: ...ures give detailed information on the various subjects relevant to usage of the 2075 3 2 CAPABILITIES OF THE EATON 2075 The 2075 is fully compatible with the IEEE 488 General Purpose Interface Bus GPIB The instrument may be operated in any of three modes LISTENER TALKER TALK ONLY and LIMITED CONTROLLER In LISTENER TALKER mode an external controller controls the 2075 via an IEEE 488 GPIB When the i...

Page 28: ... surements A cascade measurement gives a single value which includes the noise of the Device Under Test the first stage combined with the noise of the measurement system the second stage No Second Stage Calibration is necessary before making cascade measurements A corrected or first stage measurement is essentially a cascade measurement from which the noise contribution of the measurement system h...

Page 29: ... The controls and indicators and their functions are listed in Table 3 1 Because the 2075 offers such a wide range of available functions a single key may initiate two or more functions The primary function of such a key is indicated by the key label or designation For example the key START FREQ is used to allow display or entry of the start frequency for a swept measurement The primary function o...

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Page 31: ...REO allows entry of sweep stop frequ ency SWEEP initiates continuous automatic sweeping STEP SIZE allows entry of frequency step size 1 FREOUENCY DISPLAY shows frequencies in MHz Window A FIXED FREO allows entry of frequency for Single frequency measurement FREQUENCY INCREMENT MANUALLY FREOUENCY DECREMENT MANUALLY CI ENR allows entry of ENR values into ENR tables 1 ON OFF switches noise drive volt...

Page 32: ...FF is the AC power switch ID SMOOTHING INDICATOR shows degree of smoothing Each LED bar represents apower of 2increase 12 INCREASE SMOOTHING adds smoothing in increments of power of 2 DECREASE SMOOTHING subtracts smoothing in power of 2increments l li l t J j i f i F G selects measurement DATA ENTRY KEYPAD for entry of numeric values Im CLEAR clears front panel data keyed in but not yet ENTERED EN...

Page 33: ...ecial functions are set to their default 0 values or to some active state 1 2 3 etc To enter the viewing mode press and use the UP ARROW and DOWN ARROW keys to move through the table When already in this viewing mode to change or enter a special function enter the desired special function code by pressing 1 numeric keys 1 This will also cause an exit from the viewing mode To exit the special funct...

Page 34: ...ed This display also has 8 annunciators The 4 annunciators on the left refer to GPIB states These are SRQ service request RMT remote TALK and LISTEN The four annunciators on the right are LO local oscillator IF intermediate frequency RF and ENTER A blinking ENTER annunciator signals the operator to enter a frequency value into an ENR table Initiates the entry mode for ENR versus frequency values i...

Page 35: ...splays Gain G or lass ENR DISPLAY values and temperature values entered by the user Gain lass and ENR values may be displayed in dB or as ratios Temperatures may be displayed as kelvins degrees Centigrade or degrees Fahrenheit The eight annunciators in this display are LOSS ENR T degrees F T degrees C dB RATIO T K and ENTER The ENTER annunciator blinks when the user is required to enter an ENR val...

Page 36: ...ts own noise figures at different frequencies and stores these values for later use during corrected noise figure and gain measurements Press 1CALIB 1 This key also is used to abort a calibration in progress Press tCALIB 1 Initiales a second stage calibration at the single fixed frequency to which the 2075 is currently tuned Press l SHIFT 1 1CAUB 1 17 POWER ON Applies line voltage to the 2075 when...

Page 37: ...Calibration 23 8 Initiates rneasurement of uncorrected Noise Figure Press 8 Initiates rneasurernent of uncorrected Te Effective Noise Ternperature in kelvins Press 1 SHIFT 1 8 24 RELAY This green lamp lights to indicate that the selected relay power voltage is present POWER ON at the RELAY POWER OUTPUT CONNECTOR This voltage is automatically INDICATOR turned on when the CALIB key is pressed 25 REL...

Page 38: ... currently displayed Press 1CLEAR1 When in the ENR versus Frequency entry mode clears the table in use Press Completes all numeric data entries Numeric data which has been keyed in does not take effect until this key has been pressed Press 1 numeric keys 1 When entering frequency and ENR values this key can be used to toggle the blinking ENTER annunciator back and forth between Window A and Window...

Page 39: ...storage registers and made active Press 1 numeric key 1 Continues a sweep which was stopped in progress from the point at which it was stopped See item 39 of this table Press Allows entry of a fixed frequency to be used for a single frequency measurement Press 1 FIXED 1 FREQ 1 numeric keys 1 Allows entry of the frequency step size for manual frequency incrementing only If the frequency step size f...

Page 40: ...d frequency mode Also causes frequency to decrement when viewing the Frequency versus ENR tables Press or hold Causes decrementing through the special functions table when in the special functions viewing mode Press or hold Allows entry of the Second Local Oscillator frequency used in DUT Device Under Test Configuration 6 Press 1 numeric keys 1 Allows entry of the upper limit for Window C measurem...

Page 41: ...range of the ANALOG NOISE METER and toset the range for the SCOPE PLOTTER OUTPUT Press ILOWER 1 LIMIT 1 numeric keys 1 Allows entry of the lower limit for Gain The minimum allowable lower limit is 30 dB The maximum allowable lower limit is 80 dB The value entered is used by the 2075 only to set the ranges for the ANALOG GAIN METER and the SCOPE PLOTTER OUTPUT Press I LOWER 1 LIMIT 1 numeric keys 1...

Page 42: ...ersion is required DUT Test Configurations 2 6 Press 1 numeric keys 1 Initiates continuous automatic sweeps from start frequency to stop frequency Each sweep is composed of incremental frequency steps across the band Press 1SWEEP1 Stops a sweep in progress and leaves the 2075 tuned to the frequency at which the sweep was stopped Seeitem 31 in this table Press 1SWEEP1 Initiates a single sweep from ...

Page 43: ...on the rear panel The internal semi rigid coaxial cable can be reshaped to make the necessary connection This BNC connector is the test output for the Final Detector output voltage This BNC connector is the test output for the 30 MHz signal which is the result of the second stage of internal downconversion in the 2075 This output connector provides a jumper selectable DC voltage of 5 15 or 30 volt...

Page 44: ...r Z axis This positive going signal blanks the oscilloscope during retrace or activates the pen lift on the plotter lt also decreases the intensity for the gain trace When both gain and noise figure are being displayed on an oscilloscope the noise trace is the brighter one The signal minimum and maximum voltages are 0 and 5 volts 10 GPIB This 24 pin connector is the input output connector for the ...

Page 45: ...ore certain of the control pararneters to known preset values This feature is typically used after a power on or when previous control pararneters are unknown Some pararneters and special functions are not affected by the PRESET function and will rernain in their previous states See Colurnn 3 of Table 3 3 for a complete list of PRESET pararneter values Total System Reset This is a special function...

Page 46: ...cy N C 1000 MNz 1000 MHz YES Ext LO 2 Frequency N C 1000 MHz 1000 MHz YES Int IF Frequency N C 30MHz 20MHz YES LO Settling Time N C N C 100 msec LO Power Level N C OdBm OdBm YES RF Frequency N C N C lOMHz RF Start Frequency N C N C lOMHz RF Stop Frequency N C N C 1900 MHz RF Sweep Delta N C N C 20MHz RF Step Size N C N C 20MHz SCOPE PLOTTER PARAMETERS Noise Upper Limit 30 30 30 YES Noise Lower Lim...

Page 47: ...s saved in register 0 Set Sequence SAVED SAVED CLEARED SPECIAL FUNCTIONS 1 N C 1 1 1 1 YES 2 N C 2 0 2 0 YES 3 N C 3 0 3 0 4 4 0 4 0 4 0 5 N C N C 5 0 YES 6 6 0 6 0 6 0 7 7 2 OR 7 6 7 2 8 8 0 8 0 8 0 9 N C 9 0 9 0 10 10 0 10 0 10 0 11 11 1 11 0 11 0 12 N C 12 0 12 0 13 13 1 13 0 13 0 14 14 0 14 0 14 0 15 15 0 15 0 15 0 16 16 1 16 1 16 1 17 17 0 17 0 17 0 18 18 0 18 0 18 0 19 19 0 19 0 19 0 20 20 0...

Page 48: ...ired measurement the instrument will continue to niake measurements in this continuous mode Thus measurements will be made before a complete and consistent set of parameters can be entered by the user This may result in error messages 3 20 TOTAL PRESET SYSTEM STORABLE or DEVICE RESET IN CLEAR SP FN 0 9 REGISTERS 34 0 34 0 35 0 35 0 36 0 36 0 37 0 37 0 38 0 38 0 39 0 39 0 40 0 40 0 YES 42 0 42 0 43...

Page 49: ...press FIXED FREO Note that this procedure is different from the procedure for entering the frequency step size for swept measurements Also note that whenever a Swept Frequency Step Size is entered it replaces the Fixed Frequency Step Size See items 32 and 40 of Table 3 1 pages 3 11 and 3 14 Manual Tuning The frequency to which the 2075 is tuned may be changed by entering a new fixed frequency or b...

Page 50: ...ple 1700 MHz press lsToPl To enter the Swept Frequency Step Size for example 25 MHz press 3 22 lsTEPl EATON 2075 lt should be noted that entry of a Swept Frequency Step Size also changes the Fixed Frequency Step Size to the value entered Two swept frequency modes are available Single Sweep and Continuous Automatie Sweeps To select Single Sweep Mode and initiate a single swept measurement press The...

Page 51: ...e calibration is performed A maximum of 100 calibration points can be taken To perform a swept frequency Second Stage Calibration press 1 CALIB 1 For more information on Second Stage Calibration see paragraph 3 34 page 3 75 After power on the 2075 is in the Fixed Frequency Mode until a swept mode is selected OPERATION 3 23 ...

Page 52: ...rement if none is selected 4 Perform a Second Stage Calibration After this step the instrument is automatically in the corrected first stage measurement mode and any corrected measurement can be made This step is not required unless corrected measurements are desired Corrected Noise Figure and Gain F G is the default measurement if none is selected 3 24 EATON 2075 The left branch of the diagram sh...

Page 53: ...ion 3 Enter Frequency Parameters Press r t Noise Source ON Second Stage Calibration Press _ EJ UNCORRECTED MEASUREMENTS F G or do step 4 F G defaultl EJ jsHIFTII G J ENR Ir JEJOOER 10P lr I CORRECTED MEASUREMENTS Figure 3 3 UNCORRECTED AND CORRECTED MEASUREMENTS 3 25 ...

Page 54: ...leted PRESET restores the control parameters to a set of known values 5 Press lsPECl This calls up or activates Table 1 The data about tobe entered will be stored in Table 1 5 2 would have called up Table 2 and 5 3 would have called up Table 3 The error message 104 may appear indicating that no data is currently stored If so it may be disregarded 3 26 EATON 2075 6 Press r 1 1 GPIB EN L _______ J T...

Page 55: ...used by the 2075 when measurements are made Table OPERATION I will continue to be used until some other table is selected by entering Special Function 5 2 5 3 5 4 or 5 0 For more detailed information on use of ENR Tables see paragraph 3 31 15 Go to paragraph 3 10 on page 3 27 to select the correct test configuration for the device to be tested 3 10 SELECTING THE CORRECT TEST CONFIGURATION The 2075...

Page 56: ... are 6 basic test configurations available 8 possible choices are shown This is because Configurations 2 and 4 rnay be used for double sideband or single sideband rneasurements EATON 2075 Column 1 shows the two basic types of devices which rnay be tested An amplifier device is tested using Configuration 1 2 or 3 A receiver device is tested using Configuration 4 5 or 6 Colurnn 2 shows how the outpu...

Page 57: ...and THAN 1 6 GHz 3 Fixed LO Swept IF Local WIDE SPEC FUND 1 3 oscillator need not be GPIB GO TO PARA 3 14 compatible Select Single Sideband MORE 4 Swept LO Fixed IF GPIB THAN SPEC FUNC 1 4 compatible local oscillator is 1 6 GHz GO TO PARA 3 15 required Select Double Side 1850 MHz WIDE band IF 4 Swept LO Fixed IF GPIB SPEC FUNC 1 4 compatible local oscillator is GO TO PARA 3 16 required Select Sing...

Page 58: ... 3or5 Test Configuration 6 ENRLJ 10 65535 f in MHz NOISE SOURCE 3 30 ENR p WFIXEDLO L_J out 10 65535 2000 65535 p out FIXED LO SWEPT SWEPT IF IF pl I in ULJlJ f in MHz f in MHz 2000 65535 fin MHz FIXED NOISE SOURCE out w 2000 65535 f in MHz LOCAL OSCILLATOR 2 LOCAL OSCILLATOR SWEPT SWEPT SWEPT p lliillJ p lnJ out out 2000 6553 2000 65535 f in MHz f in MHz MIXE LOCAL ISDU OSCILLATOR 1 MIXER SWEPT p...

Page 59: ...ection diagrams for calibration and measurement when external relays are not used Figure 3 6 shows the optional setup where external relays controlled by the 2075 are used to provide a calibration path Refer to Paragraph 3 34 page 3 75 EXT CTLR OPTIONAL 2 07_5_A_NA_L_Y_ZE_R ____ J a c J C J a c J a l J l I 2 07_5_AN_A_L_Y_ZE_R____ J a c J C J a c J a l I l I i i EL i i 8 i i 8 a a a GPIB t 1EEt 1 ...

Page 60: ...raph 3 40 page 3 86 c Employ bandwidth compensation if required see Paragraph 3 38 p ge 3 82 6 Press 3 32 lsPECl 1 1 GPIB T1 L J EATON 2075 This will activate the HOLD function to prevent the 2075 from making measurements before all the front panel control parameters have been entered 7 To enter the sweep start frequency for example 10 MHz press fSrAITTl 1 1 GPIB FA10MZ L J 8 To enter the sweep st...

Page 61: ... frequency 14 To initiate continuous swept measurements press r 1 1 GPIB SR 1 1 1 L _______ J As the 2075 steps through the band each RF frequency will be displayed in Window A each OPERATION Gain value will be displayed in Window B and each corrected Noise Figure value will be displayed in Window C The instrument will continue to rnake automatic continuous sweeps While the instrument is sweeping ...

Page 62: ...mpatible Paragraph 3 44 on page 3 95 contains information on PROM stored control programs for external local oscillators Paragraph 3 45 on page 3 96 contains information on writing user defined control programs for external local oscillators Equipment Setup Figures 3 7a and 3 7b are the connection diagrams for calibration and measurement when external relays are not used An optional setup can be u...

Page 63: ...this has previously been done 5 Press lsPECl This selects Test Configuration 2 r 1 1 GPIB D2 L J 6 Perform the following steps if they apply a Enter the cold temperature of the noise source See Paragraph 3 41 page 3 88 b Enter any losses before or after the DUT See Paragraph 3 40 page 3 86 c Employ bandwidth compensation if required See Paragraph 3 38 page 3 82 7 Press rsPECl OPERATION 1 1 GPIB T1...

Page 64: ... 2075 First a frequency calibration FCAL is done and then a CALO CALl CAL2 and CAL3 Tue frequency parameters entered in Steps 8 9 and 10 determine the frequency points for the calibration In this case the calibration is done every 200 MHz from 8000 MHz to 12000 MHz When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key ...

Page 65: ...uency Measurements To rnake a fixed frequency single frequency measurement instead of swept frequency insert the following variations into the procedure above The example given is for a fixed frequency measurernent at 9000 MHz OPERATION a In place of Step 8 press FIXED FREO 0 b Do not perforrn Steps 9 and 10 c In place of Step 18 Calibration press This initiates a calibration at the fixed frequenc...

Page 66: ...D Equipment Setup Procedure Figures 3 8a and 3 8b are the connection diagrams for calibration and measurement when external relays are not used An optional setup can be used where external relays controlled by the 2075 provide a calibration path See Paragraph 3 34 page 3 75 3 38 This procedure is used for making corrected Noise Figure and Gain swept measurements Immediately following the procedure...

Page 67: ...nter any losses before or after the DUT See Paragraph 3 40 page 3 86 c Employ bandwidth compensation if required See Paragraph 3 38 page 3 82 7 Press r 1 1 GPIB T1 L l OPERATION This will activate the HOLD function and prevent the 2075 from making measurements before all the front panel control parameters have been entered 8 To enter the sweep start RF frequency for example 8000 MHz press ISWITl r...

Page 68: ...o l FCAL is done and then a CALO CAL1 CAL2 and CAL3 The frequency parameters entered in Steps 8 9 and 10 determine the frequency points for the calibration In this case the calibration is done every 25 MHz from 8000 to 9200 MHz When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 19 Deactivate the HOLD func...

Page 69: ...ons into the procedure above The example given is for a fixed frequency measurement at 8500 MHz a In place of Step 8 press FIXEO FREQ OPERATION b Do not perform Steps 9 and 10 c In place of Step 18 Calibration press This initiates a calibration at the fixed frequency 3 4 PROCEDUREFORTEST CONFIGURATION 3 USING SINGLE SIDEBAND Description This configuration is used for measurements when 1 The DUT is...

Page 70: ...age 3 75 EXT CTLR 2075 ANALYZER ol B C I fil OPTIONAL lo lo B C I 0 D 0 GPIB mzm O 0 CD OPTIONAL FILTER IF VARIABLE RF t MIXER to reject AF image frequencies LO FIXED LOCAL OSCILLATOR Figure 3 9a TEST CONFIGURATION 3 CALIBRATION 3 42 EXT CTLR 2075 ANALYZER OPTIONAL DI 1 10 1 10 B C I B C I LOCAL OSCILLATOR fil 0 0 0 mzm GPIB O 0 CD OPTIONAL NOISE SOURCE IF VARIABLE OUT to reject RF image frequenci...

Page 71: ...as previously been done 5 Press lsPECl This selects Test Configuration 3 r 1 1 GPIB D3 L _______ J 6 Perform the following steps if they apply a Enter the cold temperature of the noise source See Paragraph 3 41 page 3 88 b Enter any losses before or after the DUT See Paragraph 3 40 page 3 86 c Employ bandwidth compensation if required See Paragraph 3 38 page 3 82 7 Press lsPECl OPERATION 1 1 GPIB ...

Page 72: ... a CALO CAL1 CAL2 and CAL3 The frequency parameters entered in Steps 8 9 and 10 deterrnine the frequency points for the calibration In this case the calibration is done every 20 MHz from 5900 to 6500 MHz When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 18 Deactivate the HOLD function by pressing lsPECl ...

Page 73: ...ons into the procedure above The example given is for a fixed frequency measurement at 5900 MHz a In place of Step 8 press FIXED FREQ b Do not perform Steps 9 and 10 OPERATION c In place of Step 17 Calibration press This initiates a calibration at the fixed frequency 3 15 PROCEDURE FOR TEST CONFIGURATION 4 FOR DOUBLE SIDEBAND MEASUREMENTS Description This configuration is used for measurements whe...

Page 74: ...NT DOUBLE SIDEBAND Procedure This procedure is used for making corrected Noise Figure and Gain swept measurements Immediately following the procedure steps are given for making fixed frequency corrected Noise Figure and Gain measurements In Paragraphs 3 19 through 3 28 steps are given for making other measurements such as Effective Input Noise Temperature Y Factor etc 3 46 1 Connect the test equip...

Page 75: ...ge 3 86 c Employ bandwidth compensation if required See Paragraph 3 38 page 3 82 7 Press lsPECl 1 1 1 GPIB T1 1 1 1 L J This will activate the HOLD function This prevents the 2075 from making measurements before all the front panel control parameters have been entered OPERATION 8 To enter the sweep start RF frequency for example 6000 MHz press START FREO 1 1 GPIB FA6000MZ L J 9 To enter the sweep ...

Page 76: ...ration is done at the fixed IF frequency of 10 MHz When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 19 Deactivate the HOLD function by pressing lsPECl GPIB TO L _______ J When the HOLD is deactivated the 2075 automatically begins making fixed frequency measurements of corrected Noise Figure and Gain at ...

Page 77: ...ep 18 Calibration press This initiates a calibration at the fixed frequency OPERATION 3 16 PROCEDURE FOR TEST CONFIGURATION 4 FOR SINGLE SIDEBAND MEASUREMENTS Description This configuration is used for measurements when 1 The DUT is a receiver type device 2 The DUT output frequencies IF are lower then 1850 MHz 3 The RF range over which measurements will be taken is less than 1 6 GHz wide Measureme...

Page 78: ...R Figure 3 llb TEST CONFIGURATION 4 MEASUREMENT SINGLE SIDEBAND Procedure This procedure is used for making corrected Noise Figure and Gain swept measurements Immediately following the procedure steps are given for making fixed frequency corrected Noise Figure and Gain measurements In Paragraphs 3 19 through 3 28 steps are given for making other measurements such as Effective Input Noise Temperatu...

Page 79: ...if required See Paragraph 3 38 page 3 82 7 Press r 1 1 GPIB T1 L J This will activate the HOLD function This prevents the 2075 from making measurements before all the front panel control parameters have been entered OPERATION 8 To enter the sweep start RF frequency for example 8000 MHz press START FREQ 1 1 GPIB FA8000MZ L J 9 To enter the sweep stop RF frequency for example 9200 MHz press lsTOPl G...

Page 80: ...ration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 19 Deactivate the HOLD function by pressing lsPECl r 1 1 GPIB TO L J When the HOLD is deactivated the 2075 automatically begins making fixed frequency measurements of corrected Noise Figure and Gain at the start frequency which in this case is 8000 MHz lt makes corrected measure ments as opposed to uncor...

Page 81: ... fixed frequency OPERATION 3 17 PROCEDURE FOR TEST CONFIGURATION 5 SINGLE SIDEBAND Description This configuration is used for measurements when 1 The DUT is a receiver type device 2 The DUT output frequencies IF are lower than 1850 MHz 3 The RF range over which measurements will be made is less than 1 6 GHz wide Measurements are made using single sideband mode only 4 A GPIB compatible local oscill...

Page 82: ...igure 3 12b TEST CONFIGURATION 5 MEASUREMENT EATON 2075 This procedure is used for making corrected Noise Figure and Gain swept measurements Immediately following the procedure steps are given for making fixed frequency corrected Noise Figure and Gain measurements In Paragraphs 3 19 through 3 28 steps are given for making other measurements such as Effective Input Noise Temperature Y Factor etc 1 ...

Page 83: ...sation if required See Paragraph 3 38 page 3 82 7 Press lsPEcl r 1 1 GPIB T1 1 1 1 L J This will activate the HOLD function which prevents the 2075 from making measurements before all the front panel control parameters have been entered OPERATION 8 To enter the sweep start RF frequency for example 10010 MHz press START FREO r 1 1 GPIB FA10010MZ L J 9 To enter the sweep stop RF frequency for exampl...

Page 84: ...L3 The frequency parameters previously entered determine the frequency points for the calibration In this case the calibration is done at the IF frequencies from 500 MHz to 1490 MHz at 20 MHz steps When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 18 Deactivate the HOLD function by pressing r GPIB TO L J...

Page 85: ...n is for a fixed frequency measurernent at 10400 MHz a In place of Step 8 press FIXED FREQ OPERATION b Do not perforrn Steps 9 and 10 c In place of Step 17 Calibration press This initiates a calibration at the fixed frequency 3 18 PROCEDURE FOR TEST CONFIGURATION 6 Description This configuration is used for rneasurements when l The DUT is a receiver type device 2 The DUT output frequencies IF are ...

Page 86: ...rt frequency to the stop frequency Equipment Setup Figures 3 13a and 3 13b are the connection diagrams for calibration and measurement when external relays are not used An optional setup can be used where external relays controlled by the 2075 provide the calibration path See Paragraph 3 34 page 3 75 2075 ANALYZER D __ J 1 D 1 ID EXT CTLR OPTIONAL EATON 2075 l l B l l LOCAL OSCILLATOR 3 58 EEm NOI...

Page 87: ...are given for making other measurements such as Effective Input Noise Temperature Y Factor etc 1 Connect the test equipment as shown in the calibration setup of Figure 3 13a or the optional setup using external relays 2 Apply AC power to the 2075 3 Press IPRESETI 1 1 1 GPIB Device Clear or Selective Device Clear 1 1 1 L J This sets the front panel control parameters to preset values See Paragraph ...

Page 88: ...or example 100 MHz press 3 60 lsTEPl r 1 1 GPIB SS100MZ L _____________ J EATON 2075 11 To enter the fixed frequency of the DUT integral local oscillator for example 39000 MHz press r 1 1 GPIB SL39000MZ 1 1 L J 12 To enter the fixed IF output frequency from the external mixer for example 20 MHz press START FREQ 1 1 GPIB IF20Mz 1 1 L J 13 To select the desired single sideband parameter In this exam...

Page 89: ...ps When external relays are used to provide the calibration path the 2075 automatically applies voltage to the relays when the CALIB key is pressed 20 Deactivate the HOLD function by pressing lsPECl r GPIB TO L l When the HOLD is deactivated the 2075 automatically begins making fixed frequency me surements of corrected Noise Figure and Garn at the start frequency which in this case is 42000 MHz lt...

Page 90: ...ther noise related measurements These are listed below in Table 3 5 Note that some of these measurements can be made in cascade uncorrected only some can be made as First Stage corrected only and some can be made either way Table 3 5 Additional Measurements MEASUREMENT SYMBOL MODE Effective Input Te Cascade or Noise Temperature First Stage Y Factor y Cascade only Operating Noise Top Cascade or Tem...

Page 91: ... and is always expressed in kelvins Window B will display the Gain of the DUT in dB or as a ratio OPERATION 3 21 Y FACTOR V MEASUREMENT Y Factor is a ratio of the noise power output from the DUT when the noise source is ON or hot to the noise power output from the DUT when the noise source is OFF or cold lt can be expressed as dB or as a ratio Y Factor measurement can be made as an automatic or as...

Page 92: ...using Special Function 18 1 For detailed information on Loss Compensation refer to Paragraph 3 40 2075 ANALYZER N S Figure 3 14a T0 P SETUP CALIBRATION 3 64 EATON 2075 The temperature of the loss which is the ambient temperature is entered using Special Function 18 2 If there is a loss following the DUT and it is not part of the second stage it must be entered as Loss 2 If there is a loss followin...

Page 93: ...m the Second Stage Calibration in the normal manner 5 To select the measurement press lsPECl 6 To make the measurement press the apropriate keys which select single sweep or continuous sweeps per the basic procedure The measurement results will be displayed in Window C Tue units of display are kelvins GPIB codes Special Function 18 l is Ll Special Function 18 2 is L2 Special Function 18 3 is L3 Sp...

Page 94: ...T The 2075 can be used to measure the ENR values of a noise source In this procedure Second Stage Calibration is performed using a noise source with known ENR values Tue noise source with unknown values is then installed in the test setup and measured using Special Function 11 6 The calculation for this measurement is ENR 10 log Th 290 290 Where Th is the hot or ON temperature of the noise source ...

Page 95: ...n the setup Select M by pressing lsPECl OPERATION Press the appropriate keys to execute a swept measurement The measurement results for M will be displayed in Window C The results for Gain will be displayed in Window B 3 26 MANUAL MEASUREMENTS The 2075 can make manual measurements of Noise Figure and Gain or Y Factor A true hot cold thermal noise source is generally used for manual measurement of ...

Page 96: ...bars will be displayed in Window C when this step is completed EATON 2075 8 Continue the calibration sequence for the hot noise source by pressing 1ON OFF1 The messages CALl CAL2 CAL3 and then CALO will appear in Window B During this process the green NOISE DRIVE LED will light to indicate that the hot calibration is being performed and Window C will display double bars 9 Disconnect the hot noise ...

Page 97: ... Function 11 1 and the procedure for thi method is given in Paragraph 3 21 Ma ual measurement of Y Factor requires a contmuously variable precision attenuator such as the Eaton 32 Series In general such attenuators are optimized for operation at a single frequency typically 30 MHz Ifthe DUT operates at a different frequency it will be necessary to convert the DUT outpu frequenc to that of he atten...

Page 98: ...ISE DRIVE indicator will go out when the voltage is off 8 Reduce the value of the precision variable attenuator until the voltage displayed in Window A is exactly the same as it was in Step 6 For example the attenuator is reduced to 5 35 dB to again obtain a voltage reading of 2 9805 9 Compute the difference between the attenuator settings in Step 6 and Step 8 This difference is the Y Factor in dB...

Page 99: ...valid range is from 1 ms to 10 seconds 10 000 ms To enter the time delay for a gas discharge noise source for example 75 ms press lsPECl To activate the time delay press lsPECl Generally a time delay of 1 millisecond is sufficient 3 30 NOISE DRIVE VOLTAGE AND INDICATOR When measurements are made the 2075 supplies pulses which turn the noise source on and off These pulses are supplied via the front...

Page 100: ...quency and ENR values are stored in pairs That is each frequency is stored with the ENR value for that frequency The valid range for frequency entries is 10 MHz through 65 535 MHz The 3 72 EATON 2075 maximum allowable ENR entry is 80 dB However the effective ENR at the input of the DUT cannot exceed 18 dB The extra range the difference between 18 and 80 dB is to allow for losses between the noise ...

Page 101: ...will wrap around and begin again at the lowest frequency Pressing or holding the DOWN ARROW key causes movement through the table in the opposite direction To delete a table entry first display the entry using the UP ARROW or DOWN ARROW keys Theo press CLEAR Both the frequency and the ENR value which were displayed are deleted The ENTER annunciators in Windows A and B auide the user in making entr...

Page 102: ...cond Stage Calibration is performed or when a measurement is taken The ENR values are used during the calculation of second stage no_ise figures at each calibration point and also dun g calculation of first stage Device Under Test n01se figure 3 74 EATON 2075 During calibration and measurement the 2075 interpolates ENR values for frequencies between those stored in the table GPIB code examples are...

Page 103: ...ints across the band These measurements are taken at up to 100 frequency points for each of three different input gain settings The term SECOND STAGE refers to the 2075 and any other equipment which is part of the measurement system following the Device Under Test The term FIRST STAGE refers only to the Device Under Test and any components between the noise source and the OUT Before any corrected ...

Page 104: ...ALIB 1 The 2075 performs a frequency calibration and then the second stage calibration During this process the front panel successively displays FCAL CALO 3 76 during the Frequency Calibration FCAL is not performed if Special Function 15 is set to 15 2 during initialization of the calibration tables CALl CAL2 CAL3 during calibration at the first input gain setting 25 dB during calibration at the s...

Page 105: ...levels of RF attenuation he 2075 places in its RF amplifier section The greater the external gain of the second stage the more attenuation is required Where an external amplifier with more than 4 dB of gain is part of the Second Stage a group of input gain settings must be chosen by the user The correct input gain settings will prevent the input to the 2075 from exceeding the allowable power range...

Page 106: ...message disappears the calibration is completed 3 37 SELECTION OF SIDEBAND PARAMETERS When using Test Configurations 2 through 6 external downconversion is performed and a sideband parameter must be selected Double sideband can be selected only in Test Configurations 2 and 4 Single sideband either upper or lower can be selected in Test Configurations 2 through 6 Speaking generally double sideband ...

Page 107: ...NT RANGE II 3 7 4 2 FREQUENCY OPERATION 3 IF frequencies vary from 1 5 GHz to 1 0 GHz 5 2 3 7 1 5 GHz to 5 2 4 2 1 0 GHz 4 Unfiltered image frequencies will fold into the IF frequencies 6 7 5 2 1 5 GHz to 6 2 5 2 1 0 GHz 5 To obtain accurate measurements a low pass filter is used to filter out the image frequencies The cutoff frequency of the filter must be between 4 2 GHz and 6 2 GHz lt would be ...

Page 108: ...lter out the image frequencies The cutoff frequency of the filter must be between 6 6 GHz and 7 0 GHz lt is 3 80 much more difficult to find a filter with a cutoff frequency in this range since it is only 400 MHz wide The filter must not roll off below 6 6 GHz and it should achieve 40 dB or more of rejection by 7 0 GHz 6 If the filter is to provide isolation between the DUT and the mixer its cutof...

Page 109: ... are desired from 8 0 GHz to 9 2 GHz The RF range is 1 2 GHz wide 2 The local oscillator frequency is varied from 9 8 GHz to 11 0 GHz 3 The IF frequency is fixed at 1 8 GHz 9 8 8 0 1 8 GHz to 11 0 9 2 1 8 GHz 4 Unfiltered image frequencies will fold into the IF frequencies 11 6 9 8 1 8 GHz to 12 8 11 0 1 8 GHz 5 To obtain accurate measurements a low pass filter must be used to filter out the image...

Page 110: ... filter out the image frequencies The cutoff frequency of the filter must fall between 9 6 and 11 6 GHz a range of 3 82 2000 MHz If local oscillator leakage and mixer products are to be isolated from the DUT the filter cutoff frequency would have to fall between 9 6 and 9 8 MHz a range of only 200 MHz Thus it can be seen how increasing the RF measurement range increases the difficulty of obtaining...

Page 111: ...elects no bandwidth compensation and uses default values of 5 0 MHz for each bandwidth The nominal bandwidth of the 2075 is 5 0 MHz and this is usually the bandwidth of the Second Stage However where external amplifiers or mixers are used as part of the Second Stage and one of these has a bandwidth narrower than 5 0 MHz this narrower bandwidth is the bandwidth of the Second Stage For example if an...

Page 112: ...oying an alternate scheme This scheme is accomplished by adding a narrow band pass filter to the Second Stage The bandwidth of the filter must be less than the bandwidth of the DUT This makes the First Stage BW wider than the Second Stage BW lt thereby eliminates the need to use BW compensation and eliminates the need to know the precise bandwidths of the two stages Where this method is used enter...

Page 113: ...e DUT If the power meter reading decreases from that noted in Step 3 the decrease is the insertion gain of the DUT 2075 ANALYZER 0 ____ Noise Source To measure the insertion loss or gain of the DUT using the 2075 perform the following steps 7 Connect the noise source to the input of the 2075 as shown in Path A of Figure 3 27 below 8 Set the Start and Stop frequencies 4 MHz above and 4 MHz below th...

Page 114: ... loss between the noise source and the Device Under Test Loss 2 is a loss between the Device Under Test and the 2075 Typically such losses are due to test cables or other devices which are part of the First Stage and therefore are not in the setup during Second Stage Calibration When the values for Loss 1 and Loss 2 are entered a single temperature for both losses is also entered Loss 1 and Loss 2...

Page 115: ...al Function 17 1 1 To turn on Loss Compensation press The example above shows the procedure for employing loss compensation The Device Under Test is an amplifier which has a loss of 3 03 dB in series with its input Loss 1 and a loss of 6 11 dB in series with its output Loss 2 The ambient temperature is 298 0 kelvins The measurement procedure does not change from those given in the test configurati...

Page 116: ... is a mixer there are no sidebands during Second Stage Calibration because the mixer is not in the setup That is the 2075 is using single sideband for the calibration but makes the measurement using double sideband In such a case enter a value of 3 for Loss 1 The 2075 will compensate for the additional unwanted noise power from the unwanted sideband when making the measurement This increases accur...

Page 117: ...ing the temperature entry The GPIB code for Tcold is TC In the above graph the degree of error is derived for the following equations The inexact equation is F The exact equation is F Th 290 K 290 K y 1 Tc 290K 3 42 OSCILLOSCOPES AND RECORDERS TO DISPLAY DATA The 2075 can output measurement data for display on an oscilloscope an X Y plotter or a strip chart recorder The setup procedures are simila...

Page 118: ...d Gain connecting the display device and adjusting its controls The LOWER LIMIT and UPPER LIMIT keys are used to enter the limits for noise and gain measurements The non shifted mode is used for entering noise measurement limits and the shifted function is used for setting Gain limits The allowable range for noise measurements is 30 through 9999 3 90 SPECIAL GPIB FUNCTION CODE 7 0 NP 7 1 Pl 7 2 P2...

Page 119: ...es on the scope screen so that vertical scaling will be accurate Verify that the pattern s diagonal lines cross near the center of the screen Adjust the INT lntensity control on the rear panel of the 2075 to obtain a perceptible difference in intensity between the two halves of the test pattern Adjust the INTENSITY Control on the 2075 rear panel to obtain aperceptible difference in intensity betwe...

Page 120: ... Enter the Gain upper limit in this example 40 dB by pressing UPPER LIMIT 7 Make the measurement by pressing SWEEP The data will be displayed on the oscillscope as the 2075 makes continuous automatic sweeps The figure below is a typical oscilloscope display using Special Function 7 0 Notice that one trace is fainter than the other When Noise Figure and Gain are displayed simultaneously the Noise F...

Page 121: ... frequency step will be displayed as a füll segment on the oscilloscope Output to an X Y Plotter _ When measurement data is output to an X Y plotter swept measurements must be made using 256 frequency steps or less Otherwise the 2075 will not output the data 1 Connect the X AXIS Y AXIS and Z AXIS outputs on the rear panel to the X Y and pen lift inputs of the X Y plotter Use DC mode for the X and ...

Page 122: ...urrent programmed value is displayed in Window C 3 Enter the noise measurement upper lirnit in this example 6 dB by pressing 3 94 UPPER LIMIT EATON 2075 4 Enter the Gain lower limit in this example 0 dB by pressing LOWER LIMIT 5 Enter the Gain upper limit in this example 40 dB by pressing 1 SHIFT 1 6 Press UPPER LIMIT The 2075 will output the lower lirnit alignment point to both channels Adjust th...

Page 123: ...uracy 4 Low noise ouput i e low phase noise and low floor noise with very low spurious output Special care must be taken concerning this point Heterodyne signal generators may be unsuitable Some so called synthesizing signal generators switch to a heterodyning process below 2 0 or 2 5 GHz OPERATION Cavity stabilized klystrons produce the cleanest signals but are cumbersome and are not GPIB program...

Page 124: ...valent for that ASCII character The decimal equivalent is 6 When the program executes the 2075 will insert the appropriate frequency in MHz in this location The ASCII character BEL CNTRL G can be used to allow insertion of GHz instead of MHz 4 Enter the FREQUENCY TERMINATOR for the sweep generator by entering the decimal equivalents for the required ASCII characters 3 96 EATON 2075 5 Enter the OUT...

Page 125: ...r level terminator DM press this enters the ASCII D this enters the ASCII M OPERATION 8 To enter the codes that disable amplitude modulation AO press this enters the ASCII A this enters the ASCII 0 9 To enter the codes that disable frequency modulation DO press this enters the ASCII D this enters the ASCII 0 10 To enter the codes that disable pulse modulation PO press this enters the ASCII P this ...

Page 126: ... enters the ASCII R this enters the ASCII 1 13 To terminate the entry sequence press 1ENTER1 14 To select the custom program as the control program press fSPECl 15 To put the the 2075 in the LIMITED CON TROLLER mode press lsPECl This concludes the procedure 3 98 EATON 2075 ...

Page 127: ...13 m 109 01101101 155 60 SC13 N 78 01001110 11S 4E TA14 n 110 01101110 156 SE SC14 0 79 01001111 117 4F TA15 0 111 01101111 157 6F SC15 p 80 01010000 120 50 TA1S p 112 01110000 1SO 70 SC16 a 81 01010001 121 51 TA17 q 113 01110001 161 71 SC17 R 82 01010010 122 52 TA18 r 114 01110010 162 72 SC18 s 83 01010011 123 53 TA19 s 115 01110011 163 73 SC19 T 84 01010100 124 54 TA20 t 116 01110100 1S4 74 SC20...

Page 128: ...00 45 00101101 055 20 LA13 so 14 00001110 016 OE 46 00101110 056 2E LA14 SI 15 00001111 017 OF I 47 00101111 057 2F LA15 DLE 16 00010000 020 10 0 48 00110000 060 30 LA16 OC1 17 00010001 021 11 LLO 1 49 00110001 061 31 LA17 OC2 18 00010010 022 12 2 50 00110010 062 32 LA18 OC3 19 00010011 023 13 3 51 00110011 063 33 LA19 OC4 20 00010100 024 14 DCL 4 52 00110100 064 34 LA20 NAK 21 00010101 025 15 PPU...

Page 129: ... table for examination press OPERATION Then use the UP ARROW and DOWN ARROW keys to move up and down through the table to view the current state of each special function To exit the Table Viewing Mode press the SPEC FUNC key again or complete the keystroke sequence for making a special function entry numeric keys and then ENTER Note that only one special function may be changed or entered while in...

Page 130: ...compensation ENR Table 5 0 PREV y BO Use nominal value of ENR Selection 5 1 Bl Use ENR Table 1 user must enter 5 2 B2 Use ENR Table 2 user must enter 5 3 B3 Use ENR Table 3 user must enter 5 4 B4 Use ROM ENR Table Special ROM required Measurement 6 0 6 0 N N A Normal Measurement Mode 6 1 N A Manual Noise Figure Measurement XIY Output 7 0 7 2 N NP Display NF and Gain vs Frequency on scope Configura...

Page 131: ...matic frequency calibration Calibration 15 l FC Do an FCAL and return to 15 0 Interval 15 2 DF Disable auto freq calibration function Selection Second Stage 16 l 16 l N Cl Use calibration setting 1 0 15 30 dB Calibration 16 2 C2 Use calibration setting 2 15 30 40 dB Input Gain 16 3 C3 Use calibration setting 3 30 40 55 dB Selection Loss Compen 17 0 17 0 N NS No loss compensation sation Select 17 l...

Page 132: ...qualified 31 0 31 0 N N A Return to NF measurement service 31 l N A Display test personnel 31 2 N A Keyboard test only 32 0 32 0 N N A Return to NF measurement 32 1 N A Memory board RAM test 32 2 N A CPU board RAM test 32 3 N A Scope Plotter RAM test 33 0 33 0 N N A Return to NF measurement 33 l N A ROM 1 checksum 33 2 N A ROM 2 checksum 33 3 N A ROM 3 checksum 33 4 N A ROM 4 checksum 33 5 N A ROM...

Page 133: ... NI All SRQs disabled Request 42 l RA SRQ on data ready Service 43 0 43 0 N NI All SRQs disabled Request 43 l RC SRQ on calibration complete 44 0 Not used 44 l Service 45 0 45 0 N NI All SRQs disabled Request 45 l RT SRQ on ready to tune Service 46 0 46 0 N NI All SRQs disabled Request 46 l RI SRQ on instrument error External LO 47 0 PREV y NIA Control program for HP 8672 LO Control 47 l NIA Contr...

Page 134: ...Transitory and Continuous Regenerative Transitory messages are displayed for two seconds and then disappear The instrument reverts to its normal activities Transitory messages usually indicate the denial of some illegal request on the part of the operator Continuous messages remain displayed until the error condition is corrected and the 2075 can function normally The error messages are divided in...

Page 135: ...B with proper lass compensation 110 Measurement at non calibrated Use 24 1 to override but result will be less accurate point 111 Frequency lower than calibration Increase the frequency so that it is within the Second table Stage Calibration range or re calibrate 112 Frequency higher than calibration Oecrease the frequency so that it is within the Second table Stage Calibration range or re calibra...

Page 136: ...ode 131 Frequency range error Enter appropriate frequencies Stop frequency is srnaller than start frequency 133 The IF tuning frequency Check the DUT configuration is beyond 10 to 1900 MHz 134 The external LO frequency Check the RF and IF cornbination is out of range 141 RF overload RF input too high Reduce the RF input power 143 Detector overload unable May have hardware problem to attenuate the ...

Page 137: ...sist then instrument requires service 910 System error Check power supply voltage 5 to 5 25 volts If OK and errors persist then instrument requires service 911 System error Check power supply voltage 5 to 5 25 volts If OK and errors persist then instrument requires service 912 System error Check power supply voltage 5 to 5 25 volts If OK and errors persist then instrument requires service 913 Syst...

Page 138: ...MOOTHING FUNCTION Smoothing can be employed to reduce jitter in displayed noise and gain measurements When smoothing is not in use each measurement result is displayed immediately Small random variations in readings can appear as very rapid changes in the least significant digits of the displayed values Smoothing is an averaging function When smoothing is employed each measurement is made many tim...

Page 139: ...thod is used In this method the number of readings taken is equal to the smoothing factor and the readings are averaged to produce the displayed value The formula for this method is shown Displayed Value Sum of S measurements s Where S is the smoothing factor In arithmetic smoothing the display is updated every time that S readings have been taken When fixed frequency measurements are made the smo...

Page 140: ... taken In Column 4 which is for a smoothing factor of 2 each displayed value is the average of the last reading just taken and the previous average To illustrate the second entry in Column 4 is 2 50 which is the average of the first 2 measurements 2 52 and 2 48 from column 1 The third entry in Column 4 is 2 53 and this is the average of 2 56 and 2 50 Measure Actual ment Measure Number ment 1 1 2 5...

Page 141: ... To determine the software update level press lsPEcl OPERATION The update level is displayed in Window Aas SU X where Xis the update level number Software Update Level 6 would be displayed as SU 6 This manual is written to software update 6 The following changes have been incorporated in SU 6 1 The maximum input frequency that can be measured at the input port is now 1900 MHz specifications apply ...

Page 142: ...ter a delay time of 2 seconds press lsPEcl To activate usage of this delay time press 3 114 lsPEcl EATON 2075 NOTE Where an external local oscillator is used the value entered under Special Function 3 1 is used for the local oscillator settling time This same value is also used for the trigger delay time if Special Function 22 1 has been activated 11 The user defined control program for external l...

Page 143: ...iled information regarding operations of the GPIB As many as 15 devices can be connected to the bus at one time There are 4 basic types of devices and these are classified according to the 3 basic bus functions which they perform CONTROLLER TALKER LISTENER and TALKER LISTENER The CON TROLLER manages the bus and tells the other devices when to talk and when to listen Only the controller can send co...

Page 144: ...versal Command Group UCG or the Addressed Command Group ACG All devices on the bus respond to a UCG commmand Only the addressed device will respond to an ACG command Both the ADDRESS TO TALK and the ADDRESS TO LISTEN command are ACG commands 4 2 The controller places the bus in Data Mode by setting the ATN line to FALSE In Data Mode data is transmitted on the 8 data lines and it is normally encode...

Page 145: ...e front panel is locked out except for the LOCAL key The 2075 can LISTEN or TALK while in this mode To select this mode press lsPECl TALK ONLY or TALK ALWAYS mode is a local mode in which the front panel controls are used to operate the 2075 This mode is used to send measurement data to a GPIB compatible printer when no external controller exists To select this mode press lsPEcl GPIB OPERATION LIM...

Page 146: ...e by default and it is also in local mode The 2075 goes into the remote mode only when it is in normal TALKER LISTENER mode and only after the external controller has placed it in remote To do this the controller first sets the REN Remote enable line TRUE and then sends an ADDRESS TO LISTEN command to the 2075 If no external controller exists the unit will remain in local mode The RMT REMOTE annun...

Page 147: ...e controller GPIB OPERATION LOCAL Message The LOCAL message is the GO TO LOCAL GTL bus cornmand When the 2075 is in remote mode and it receives this message from the controller it will respond by going to local mode Control is returned to the front panel keys If the instrument is in LOCAL LOCKOUT when the LOCAL message is received front panel control is still returned but the LOCAL LOCKOUT is not ...

Page 148: ...l lockout is cleared when the REN bus REN Set Local control line goes FALSE When entering local mode UCG no instrument settings or functions are changed Local The Noise Gain Analyzer returns to local mode front GTL ACG PLI panel control lt responds equally to the GTL bus command and the front panel LOCAL key When entering the local mode no instrument settings or functions are changed Local Disable...

Page 149: ...e condition causing the Require Service message tobe issued will both be TRUE The bits in the Status Byte are latched but can be cleared by 1 Removing the causal condition and 2 Reading the Status Byte Trigger If in remote and addressed to listen GET UCG DTl the Noise Gain Analyzer makes one measurement according to the previously programmed setup lt responds equally to bus command GET and program...

Page 150: ...eric data entry the format is as follows Header Example DG Une Terminator CR LF Note that the line terminator for the message is Carriage Return Line Feed 4 8 EATON 2075 A multiple message is formatted as follows Header Data Header Data Header Data Example FA FB ss 10 10 10 Data Terminator Data Terminator Data Terminator MZ MZ MZ Separator Separator line Terminator CR LF Note that the separator in...

Page 151: ...ic frequency calibration DG Terminator for degree unit entries EF or EN Disable ENR entry mode EN only Enable ENR entry mode ET General entry terminator code GPIB OPERATION Table 4 3 Table of GPIB Codes Continued GPIB CODE PARAMETER FO Output window C data only Fl Output window B data only F2 Output window A data only F3 Output window A B data F4 Output window A C data F5 Output window B C data F6...

Page 152: ...y vs Freq on SP SPECIAL FUNCTION oscilloscope SR SWEEPAUTO NR Front panel NF RATIO dB in RATIO ss STEP SITE prefix setting ST Settling time NS Loss compensation off TO Normal continuous measurement OP Measure operating noise temperature TI Hold measurement PI Displaytestpattern 1 on oscilloscope T2 Execute one measurement cycle and P2 Display test pattern 2 on oscilloscope hold PM Power measuremen...

Page 153: ...A 4 4 N A 5 5 N A 6 6 N A 7 7 N A 8 8 N A 9 9 N A MINUS N A dec point N A 27 CLEAR Entry N A CLEAR ENR table CT 28 ENTER ET MZ DB DG N A 29 SEQuence N A SET SEQUENCE N A 30 STORE N A N A 31 RECALL N A N A 32 FIXED FREQ FF Manual STEP SIZE N A 33 Increment N A EXT LO AMPLITUDE N A 34 Decrement N A SECOND LO FREQ SL 35 UPPER LIMIT NOISE UN UPPER LIMIT GAIN UG 36 LOWER LIMIT NOISE LN LOWER LIMIT GAIN...

Page 154: ... completion of each measurement cycle or to output data only during a Single Swept rneasurernent lt can also be configured to send Second Stage Calibration data 4 12 EATON 2075 Use this procedure to output data at the end of each rneasurement cycle when in the TALK ONLY rnode 1 Select the data rnessage content by entering the appropriate subordinate function of Special Function 49 For example to s...

Page 155: ... select Output of data frorn Windows A B and C press 2 Set the printer to LISTEN ONLY LISTEN ALWAYS rnode 3 Enable the HOLD function by pressing 4 Set the 2075 to TALK ONLY rnode by pressing 5 To perforrn the calibration and output the data to the printer press 1 CALIB 1 Tue 2075 will output data to the printer only during the calibration Where Special Function 49 6 has been entered to choose data...

Page 156: ... CAL2 9 72 300 CAL2 10 27 350 CAL2 10 93 400 CALZ 10 41 450 CAL2 11 49 500 CALZ lt 83 100 CAL3 22 75 l50 CAL3 24 03 200 CAL3 23 74 250 CAL3 23 64 300 CAL3 23 96 350 CAL3 25 39 400 CAL3 24 40 450 CAL3 25 67 500 CAL3 25 77 Frequency Gain Noise Figure 100 0 03 0 06 150 0 03 0 01 200 0 04 0 01 250 0 04 0 02 300 0 04 0 03 350 0 02 0 13 400 0 03 0 06 450 0 05 0 07 500 0 03 0 01 Figure 4 2 SAMPLE DATA OU...

Page 157: ...controller programmed in BASIC The 2075 address is 8 and it is tuned to 100 MHz Sp cial Function 40 0 is already in effect GPIB OPERATION 100 OUTPUT 708 FO Send FO for output from Window C only Enter 708 1 message Untalk 110 ENTER 708 N 120 SEND 7 UNT The above 3 lines correspond to steps 3 4 and 5 of the preceding procedure Data Message Format Data messages are sent either as single messages Spec...

Page 158: ... messages 4 11 STATUS MESSAGES Status messages are sent to the controller in the form of a Status Byte The sequence of events is 1 Same device on the bus initiates a Service Request by setting the SRQ Service Request line to TRUB 4 16 EATON 2075 2 The controller conducts a serial poll by having each device on the bus send a Status Byte The controller reads each Status Byte to determine what device...

Page 159: ...e 2075 is shown Weight 128 64 32 Bit position 7 6 5 0 GPIB OPERATION The appropriate bits are set to 1 when the condition is TRUE After the status message Status Byte has been sent it will be cleared if the 2075 receives one of the following messages from the controller SERIAL POLL DISABLE ABORT CLEAR The flowchart of Figure 4 4 shows how data is collected using the Data Ready SRQ in Test Configur...

Page 160: ...ABLE SRQ ON DATA READY GPIB CODE RA TRIGGER MEASUREMENT GPIB CODE TO TAKE MEASUREMENT AND SEND SRQ ON DATA READY TO OTHER INSTRUMENT SERVICE ROUTINES TEST OTHER 2075 SRO CONDITIONS READ STATUS BYTE FROM 2075 READ DATA FROM 2075 RETURN Figure 4 4 FLOWCHART SHOWING DATA COLLECTION IN TEST CONFIGURATION 1 USING DATA READY SRQ ...

Page 161: ...OUTPUT 708 FR 500 MZ 230 1 240 SET SMOOTHIHG FACTOR 250 1 260 OUTPUT 708 S5 270 1 280 MEASURE HOISE FIGURE 290 OUTPUT 708 HF 300 1 310 SET DATA OUTPUT FORMAT 320 1 330 OUTPUT 708 F4 340 SEND TRIGGER CODE HOLD 350 1 360 OUTPUT 708 Tl 370 380 390 WE ARE HOW READY TO MAKE 400 OUR MEASUREMEHTS 410 420 STEP 3 SEHO SRQ OH DATA RO Y430 430 440 OUTPUT 708 RA 450 460 SEND TRRIGGER MESSAGE 470 AHD PROCESS O...

Page 162: ...075 SEHT SRQ PRINT TESTIHG CAUSE IF BIT S 1 1 THEN GOTO 300 0 TEST OTHER BITS FOR OTHER POSSIBLE SRQ 1 CAUSES PRINT 2075 SEHT DATA READY SRQ PRINT REAOIHG 2075 DATA ENTER 708 F N SEND 7 IJHT OISABLE DATA RDY SRQ OUTPUT 708 HI PRINT DATA RECORD PRINT FREQ F PRINT HOISE FIG N IHITIALIZE HP 85 STATUS STATUS 7 1 S1 ENABLE ItHR 7 S IF T l THEH GOTO 6000 IF T 2 THEN GOTO 6030 1 TUNE TO NEXT FREQ AHD RE ...

Page 163: ...ry to synchronize the controller with the measurement cycle of the 2075 This synchronization is accomplished by the structure of the controller program and varies according to the type of SRQ being used Using Special Functions 42 0 through 46 0 the 2075 can be configured to initiate an SRQ on Data Ready Calibration Complete or Ready to Tune The following information shows how the program must be s...

Page 164: ...he controller to set up the external local oscillator frequency lt is a good idea to include some extra time in T settle to allow some margin 4 Send the code that configures the 2075 for SRQ on Ready to Tune RT 4 22 EATON 2075 5 Send the single sweep command to the 2075 6 If sweep is not completed wait for the SRQ from the 2075 7 Upon receiving the SRQ read the Status Byte of the 2075 If Bit 4 of ...

Page 165: ... TUNE EXTERNAL LO SENDSRQ WAIT FOR CONTROLLER TO READ STATUS WAITTsrnLE GPIB OPERATION GPIB CONTROLLER START SEND 2075 T1 SET UPALL MEASUREMENT PARAMETERS 2075 SEND 2075 TsrnLE SEND 2075 SRQ ON READY TO TUNE SEND 2075 SINGLE SWEEP COMMAND SWEEP ON READ STATUS 2075 NO PROBLEM IN SYSTEM Figure 4 8 FLOWCHART FOR SRQ ON READY TO TUNE 4 23 ...

Page 166: ...UT DATA TO DISPLAY NO YES OUTPUT DATA TO CONTROLLER CALCULATE NEW Fl ll TUNE EXTERNAL LU TO FLo ADDRESS 2075 TOTALKAND READ MEASURED DATA AT FREOUENCY F YES Figure 4 8 FLOWCHART FOR SRQ ON READY TO TUNE Continued 4 24 EATON 2075 SWEEP OFF ...

Page 167: ... 5 Send the code that tunes the external local oscillator to the sweep start frequency 6 Send the single sweep command to the 2075 7 Wait for the SRQ from the 2075 GPIB OPERATION 8 Upon receiving the SRQ read the Status Byte of the 2075 If Bit 1 of the Status Byte is set to 1 then proceed with the next step Any SRQ sets Bit 6 of the Status Byte and the Data Ready SRQ also sets Bit 1 9 Send the com...

Page 168: ...EADY ARMED STARTSWEEP SET NOISE SOURCE TUNE TAKE MEASUREMENT GPIB CONTROLLER START SEND 2075 T1 SET UPALL MEASUREMENT PARAMETERS SEND 2075 TsrnLE ARM 2075 SRQ ON DATA READY TUNE EXTERNAL LO TO START FREQUENCY SWEEP ON SEND 2075 SINGLE SWEEP COMMAND Figure 4 9 FLOWCHART FOR SRQ ON DATA READY EATON 2075 ...

Page 169: ...TPUTTO CONTROLLER YES SEND SRQ TO CONTROLLER WAIT FOR SPOLL TUNE EXTERNAL LO TO NEW FREOUENCY READ DATA FROM 2075 YES GPIB OPERATION YES READ STATUS FROM 2075 SWEEP OFF NO ERROR Figure 4 9 FLOWCHART FOR SRQ ON DATA READY Continued 4 27 ...

Page 170: ...the External Local Oscillator is a Wiltron 6600 series sweep generator During Calibration the Controller synchronizes the L O tuning and the 2075 using the READY TO TUNE SRQ interrupt RA During measurement the Controller synchronizes the L O tuning and the 2075 using the DATA READY SRQ interrupt RT User enters measurement parameters 280 DISP MAX LO POl JER I S 10DBM Depends on L 0 used 290 GOTO 19...

Page 171: ... 3 GOTO 810 CLEAR 1 BEEP DISP NO SRG DISP 11 SOMETHING SCREWED UP DISP CHECK CABLES ADORESS E TC II DISP lt DISP PRESS k4 CONT TO RE nART oN r EY 4 11 co 4T GOT o 10 CLEAR 1 BEEP OISP t 2nd STAGE CAL COMPLETE l ffl IT P30ü OUTPUT 70f II NI II POLL 708 F Fl 1 4 1 OUTPUT 719 CFEt F0 11 _ F MH 11 9 0 DISP DISP CONNECT THE OUT BETWEE 4 THE II 960 DISP 11 NOISE GENERATOR ANO TH E MI X ER 970 DISP lt DI...

Page 172: ...0 OISP FOR HEXT ACTION 1330 OISP 1340 OISP k1 TABC10 REPEAT T EST 1350 DISP k2 11 TABC10 RECAL 2n D STAGE 1360 OISP k3 TABC10 NEW TEST u 1370 DISP k4 TABC10 END TEST ING 1380 ON KEYI 1 REPEAT GOTO 1440 1390 ON KEYI 2 RE CAL GOTO 1470 1400 OH KEY 3 NEW GOTO 1500 1410 OH KEYI 4 ENO GOTO 1530 1420 KEY LABEL 1430 GOTO 1430 1440 OFF KEY 1 OFF KEY 2 0 FF KEY 3 OFF KEY 4 1450 CLEAR BEEP 1460 GOTO 950 147...

Page 173: ...nded manufacturer and model number is shown where appropriate Minimum or critical parameters are also shown Generally it is desirable to use equipment with an accuracy four times greater than the parameter being tested However for the most part these tests are internal checks perforrried by the 2075 and therefore accuracy of other test equipment is not important except for the Digital Voltmeter Te...

Page 174: ...Perform the following steps 1 Connect the 2075 to an AC power source of the appropriate voltage 5 2 EATON 2075 2 Remove any devices connected to the RF INPUT 3 Place the POWER switch in the ON position 4 The following correct indications should be observed a All front panel red LED s and indicators light briefly b The words SELF and TEST appear in Windows A and B respectively while the numbers 1 t...

Page 175: ... The words CALl CAL2 CAL3 and CAL4 will appear sequentially in Window B while the unit PERFORMANCE VERIFICATION TESTS continues to calibrate its IF stages 6 When a frequency value appears in Window A and some numeric value begins flashing in Window C this calibration procedure is successfully completed 5 7 FINAL DETECTOR BIAS TEST This procedure measures the bias voltage on the final detector No t...

Page 176: ...icating that no data is currently stored If so it may be disregarded EATON 2075 6 Press This places the 2075 in the mode which allows entry of the frequencies and ENR values The red light in the center of the ENR key is illuminated Also the ENTER annunciator in Window A begins to blink signifying that the operator is required to enter a frequency 7 Enter the first calibration frequency in MHz from...

Page 177: ...The 2075 will now display an FCAL CALO CALl CAL2 and CAL3 as it performs these steps of the calibration process 16 During the CALl while the unit takes 20 MHz steps verify that the noise figure displayed in Window C is less than 7 0 dB 001 dB MHz from 10 MHz to 1850 MHz The noise figure at 1850 MHz should be less than 8 85 dB As the 2075 steps up to 1900 MHz the noise figure may go above 8 85 dB 1...

Page 178: ... is greater than 20 volts 8c Note the value of IF attenuation displayed in Window C Use the following table to deterrrüne which special function will be required to enable the next higher value of IF attenuation 5 6 EATON207S SPECIAL FUNCTION IF ATTENUATION 38 0 Auto ranging 38 1 OdB 38 2 5 dB 38 3 10 dB 38 4 15 dB 38 5 20dB 39 0 Auto ranging 39 1 25 dB 39 2 30 dB 39 3 35 dB 39 4 40dB 39 5 45 dB 8...

Page 179: ... 14 and 20 PERFORMANCE VERIFICATION TESTS 27 Press ISPECl This returns the 2075 to its attenuation auto ranging mode This concludes the Final Detector Linearity Test 5 10 SCOPE PLOTTER OUTPUT TEST This test verifies the proper functioning of the X Y and Z outputs which are used to drive an external oscilloscope or plotter This procedure requires either a dual channel oscilloscope with an X Y mode ...

Page 180: ...the oscilloscope 8 Press lsPECl 9 A dot will appear in the lower left corner of the oscilloscope display This is the first alignment point used for aligning an X Y plotter 5 8 10 Press lsPECl 11 A dot will now appear in the upper right corner This is the second alignment point used for aligning an X Y plotter This concludes the oscilloscope plotter output test This concludes the performance verifi...